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Assesment of hydraulic Characteristics has been carried out of Daegokcheon because Sa-yeon dam water level decline operation for proper due to world cultural heritage edged Bangudae petroglyphs. Analyses on the Dae-gok stream were conducted by changing the water level of the Sa-yeon Dam by using the 1D HEC-RAS numerical model for the inundation of height variations and 2D RMA-2 model for the flow characteristics. As a result of the modeling, if the water elevation on the Sa-yeon Dam is higher than EL.52.5 m, the Bangudae Petroglyphs starts to be flooded. The Bangudae Petroglyphs starts submerging from EL.60.0 m to EL.56.5 m on Sa-yeon Dam. The Bangudae Petroglyphs water level increased by 2.7 m for 20year and 3.47 m for 200year flood frequencies, 73% and 93.8% of the inundation occurs, respectively. As a result of the change on the water level of the Sa-yeon Dam, from EL.52.5 m to EL.60.0 m, the flood flow characterization on the Bangudae Petroglyphs showed that the velocity multiplied by 2.5 times the normal flow. The maximum velocity directly approches the Bangudae Petroglyphs thus, causing damaged.

Analysis on Hydraulic Characteristics at Bangudae Petroglyph by Water Level Declination of Sa-yeon Dam